CN108397361B - A kind of double-fed fan blade wheel hub axial direction telescopic device and its double-fed blower - Google Patents
A kind of double-fed fan blade wheel hub axial direction telescopic device and its double-fed blower Download PDFInfo
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- CN108397361B CN108397361B CN201810169035.6A CN201810169035A CN108397361B CN 108397361 B CN108397361 B CN 108397361B CN 201810169035 A CN201810169035 A CN 201810169035A CN 108397361 B CN108397361 B CN 108397361B
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- axle sleeve
- fan blade
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- axial direction
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- 230000007246 mechanism Effects 0.000 claims abstract description 19
- 230000001360 synchronised effect Effects 0.000 claims abstract description 3
- 238000012423 maintenance Methods 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
- F03D1/06—Rotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
- F03D13/20—Arrangements for mounting or supporting wind motors; Masts or towers for wind motors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/728—Onshore wind turbines
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Wind Motors (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a kind of double-fed fan blade wheel hub axial direction telescopic device and its double-fed blowers, wherein, axial stretching device includes hub spindle, telescoping mechanism, axle sleeve, air velocity transducer, controller and output shaft, one end of hub spindle is connect with fan blade, the other end is connect with telescoping mechanism, the other end of telescoping mechanism and one end of output shaft connect, the other end of output shaft and the gear-box of blower connect, hub spindle be telescopically plugged in one end of axle sleeve and with axle sleeve synchronous rotary, the other end of axle sleeve and output shaft are affixed, air velocity transducer is connect with controller, controller control telescoping mechanism driving wheel hub axle moves forward and backward.The present invention can adjust in real time the centroid position of electrification component on blower fan pylon according to the wind speed outside blower, remain at the mass center of electrification component on the central axis of pylon, to improve the operational safety and service life of blower.
Description
Technical field
The present invention relates to large-scale double-fed blower technical fields more particularly to a kind of double-fed fan blade wheel hub axial stretching to fill
It sets and its double-fed blower.
Background technique
Currently, needing to increase fan blade to develop more powerful blower, blower fan pylon height is improved.Blower leaf
The increase of leaf length not only results in leaf weight and is significantly increased, and tower top horizontal direction when will lead to fan operation
Load steeply rises；At the same time, the increase of blower fan pylon height will lead to the increase of pylon flexibility.It is reduced after above-mentioned factor superposition
The ability of large-scale double-fed blower hurricane resistant, is easy to happen the blower accident of falling tower, causes a hidden trouble to the safe operation of blower.
Traditional large size double-fed blower fan structure as shown in figure 4, the hub spindle 1 being connect with fan blade 6 be directly with gear-box 7
Input axis connection, the distance between hub spindle 1 and gear-box 7 be fixed.In order to ensure fan safe operation, tradition is big
In design, the mass center that will be located at the electrification component on 21 top of pylon of blower is designed in the central axes of pylon 21 type double-fed blower
On.When blower works, the axial thrust that hub spindle 1 is transmitted by fan blade 6, the top of pylon 21 will generate the water of down wind
Prosposition moves (as shown in Figure 5), since the centroid position of electrification component is non-adjustable, positioned at the matter of the electrification component on the top of pylon 21
The heart will deviate from 21 central axes of pylon (when wind speed reaches 25 meter per second, the bias of the mass center of large fan can reach 1000mm),
Since electrification component weighs 200 tons or more, very big breaking bending moment is formed to 21 bottom of pylon, be easy to cause the tower of blower
21 unstability of frame causes the acceleration of the support connection structure or other component on blower to be failed, and even results in pylon 21 and collapses thing
Therefore.
Summary of the invention
The centroid position that it is an object of that present invention to provide a kind of by actively adjusting wind turbine power generation component makes electrification component
Centroid position is always positioned at the blade hub spindle on the central axis of pylon to telescopic device, to solve the above problems.
To achieve the above object, the present invention discloses a kind of double-fed fan blade wheel hub axial direction telescopic device first, including
Hub spindle, telescoping mechanism, axle sleeve, air velocity transducer, controller and output shaft, one end of the hub spindle and fan blade connect
Connect, the other end is connect with telescoping mechanism, and one end of the other end of the telescoping mechanism and output shaft connects, the output shaft it is another
The connection of the gear-box of one end and blower, the hub spindle is telescopically plugged in one end of the axle sleeve and same with the axle sleeve
Step rotation, the other end of the axle sleeve and the output shaft are affixed, and the air velocity transducer is connect with the controller, the control
Device processed controls the telescoping mechanism and the hub spindle is driven to move forward and backward.
Further, spline is provided on the hub spindle, the hole that the axle sleeve and the hub spindle are socketed is splined hole.
Further, the telescoping mechanism is hydraulic cylinder, and the piston rod and wheel hub axis connection of the hydraulic cylinder are described hydraulic
The cylinder body of cylinder and one end of output shaft connect.
It further, include a hollow cavity in the axle sleeve, the hub spindle is located in the inner cavity, the hub spindle
It is provided with limit stop ring in the inner cavity, to limit the overhanging stroke of maximum of the hub spindle as 1200mm.
Further, the controller is connect with the hydraulic cylinder, is increased with the wind speed measured in the air velocity transducer
When drive the piston rod to stretch out, the retract action of the piston rod is retracted by the axial power drive that fan blade generates.
Further, wireless telecommunications control mode is used between the controller and hydraulic cylinder.
It further, further include the hydraulic device being set in inner cavity, the hydraulic device includes the hydraulic cylinder, described
It is provided on axle sleeve by the brushgear in the power Transmission to hydraulic device on the outside of axle sleeve.
Further, the thickness that the axle sleeve is equipped with one end side wall of hub spindle is greater than the axle sleeve and is equipped with hydraulic cylinder
One end side wall.
Further, maintenance channel is provided on the side wall of the axle sleeve.
Then, the present invention discloses a kind of double-fed blower, axially stretches including double-fed fan blade wheel hub described in above scheme
Compression apparatus.
Compared with the prior art, the advantages of the present invention are as follows:
The present invention can adjust in real time the centroid position of electrification component on blower fan pylon according to the wind speed outside blower, make to send out
The mass center of electrical component remains on the central axis of pylon, to improve the operational safety and service life of blower, keeps away
Exempt from blower fan pylon unstability and leads to the acceleration failure of the support connection structure or other component on blower and bring pylon
Collapse accident.
Below with reference to accompanying drawings, the present invention is described in further detail.
Detailed description of the invention
The attached drawing constituted part of this application is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the structural schematic diagram of double-fed fan blade wheel hub axial direction telescopic device disclosed in the preferred embodiment of the present invention；
Fig. 2 is the A-A schematic cross-sectional view of Fig. 1；
Fig. 3 is centroid adjustment schematic diagram of the double-fed blower disclosed in the preferred embodiment of the present invention when wind speed increases；
Fig. 4 is the electrification component schematic diagram of existing blower；
Fig. 5 is existing blower mass center variation schematic diagram when wind speed increases.
Marginal data:
1, hub spindle；2, axle sleeve；3, air velocity transducer；4, controller；5, output shaft；6, fan blade；7, gear-box；8,
Spline；9, splined hole；10, hydraulic cylinder；11, piston rod；12, cylinder body；13, inner cavity；14, limit stop ring；15, brushgear；16,
Maintenance channel；17, generator；18, gearbox output shaft；19, hydraulic control valve；20, hydraulic pump；21, pylon.
Specific embodiment
The embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention can be defined by the claims
Implement with the multitude of different ways of covering.
As shown in Figure 1-Figure 3, the present invention discloses a kind of double-fed fan blade wheel hub axial direction telescopic device, including wheel first
Hub axle 1, telescoping mechanism, axle sleeve 2, air velocity transducer 3, controller 4 and output shaft 5, wherein telescoping mechanism can drive for air pressure
The mechanism of dynamic, hydraulic-driven, rack-and-pinion, ball-screw or similar achievable Telescopic, in the present embodiment, telescopic machine
Structure is hydraulic cylinder 10, and the piston rod 11 of hydraulic cylinder 10 is connect with hub spindle 1, the cylinder body 12 of hydraulic cylinder 10 and one end of output shaft 5
Connection will not rotate, one end of hub spindle 1 is connect with fan blade 6, another that is, when piston rod 11 rotates with cylinder body 12
End connect with piston rod 11, the other end (i.e. cylinder body 12) of telescoping mechanism is connect with one end of output shaft 5, output shaft 5 it is another
End is connect with the gear-box 7 of blower, by the way that power is inputted generator by gearbox output shaft 18 after the speed-raising of gear-box 7
17, to realize power generation.Wherein, hub spindle 1 be telescopically plugged in one end of axle sleeve 2 and with 2 synchronous rotary of axle sleeve, connect
The mode of connecing can be using conventional key cooperation (such as conventional square key and keyway cooperation) mode, in the present embodiment, in order to protect
Demonstrate,prove the transmitting of the power between hub spindle 1 and axle sleeve 2, and more accurate fiting effect, in the present embodiment, hub spindle 1 and axis
Spline fitted mode is used between set 2, i.e., is provided with spline 8 on hub spindle 1, and the hole that axle sleeve 2 and hub spindle 1 are socketed is splined hole
9, and the torsion that wind drive fan blade 6 generates is transmitted by the direction of hub spindle 1- axle sleeve 2- output shaft 5, wherein axis
The output end of set 2 and output shaft 5 are affixed, and air velocity transducer 3 is connect with controller 4, and controller 4 controls telescoping mechanism driving wheel
Hub axle 1 moves forward and backward.In the present embodiment, it (is used between controller 4 and hydraulic cylinder 10 using wireless telecommunications control mode
Odbus bus, Dp bus, Wifi are wireless, bluetooth approach any), it in the present embodiment, in axle sleeve 2 include one hollow
Inner cavity 13 is provided with hydraulic device in inner cavity 13, and hydraulic device includes hydraulic cylinder 10, hydraulic control valve 19 and hydraulic pump 20, leads to
It crosses 20 driving hydraulic cylinder 10 of hydraulic pump and completes expanding-contracting action, wherein communicated between hydraulic control valve 19 and controller 4, thus in work
Connection is established between stopper rod 11 and extraneous wind speed, when wind speed increases, driving wheel hub axle 1 stretch out more (as shown in figure 3, its
In, whole Fans machine is assembled on the shaft seat on 21 top of pylon, and blower unit rear portion is an empennage, can automatic adjusting position
It is directed at wind direction, so that fan blade 6 be made to remain the generating state rotated clockwise windward), when wind speed reduces, Ke Yitong
It crosses the driving of hydraulic pump 20 to retract, or closes hydraulic pump 20, piston rod is driven by axial action of the extraneous wind-force to hub spindle 1
11 retractions, since double-fed blower is connect with external electrical network, i.e., external electrical network can realize blower interior and power, in the present embodiment
In, it is contemplated that axle sleeve 2 is therefore rotary part is provided with brushgear 15 on axle sleeve 2, to realize the electricity outside axle sleeve 2
Power is transported to the inside of axle sleeve 2, to power for hydraulic pump 20 and hydraulic control valve 19 etc..Under the working environment of strong wind, when
When the mass center of electrification component moves backward, by driving the hub spindle 1 connecting with fan blade 6 to forward extend out, due to blower
Fan blade 6 and hub spindle 1 account for very big quality, to can adjust forward the mass center of electrification component, are adjusted by active
Mode avoid the centroid motion of electrification component, and then avoid centroid motion bring pylon 21 to pylon 21 and bottom surface junction
It forms big bending moment force and so that bottom junctions the failures such as is broken and occur (to particularly avoid and connect bottom in wind speed size variation
Place forms the situation that accelerates the failure of alternation torque), thus by the mass center of electrification component from the center for newly returning to initial pylon 21
Position.The present apparatus adjusts the centroid position of electrification component on the pylon 21 of blower according to the wind speed outside blower in real time, makes to generate electricity
The mass center of component remains on the central axis of pylon 21, to improve the operational safety and service life of blower, keeps away
21 unstability of pylon for having exempted from blower either causes the acceleration of the support connection structure or other component on blower to fail and bring
21 collapse accident of pylon.
In the present embodiment, according to factual survey, maximum beat of the large fan under design wind speed working range is
1000mm or so, therefore hub spindle 1 is located in inner cavity 13 and is provided with limit stop ring 14, to limit the overhanging row of maximum of hub spindle 1
Journey is 1200mm.
In the present embodiment, since the quality of the fan blade of power generator 6 is big, the position of fan blade 6 is supported on axle sleeve 2
Biggish moment of flexure can will be born by setting, and be easy to cause failure, therefore in actual design, axle sleeve 2 is equipped with the one end of hub spindle 1
The thickness of wall is greater than one end side wall that axle sleeve 2 is equipped with hydraulic cylinder 10, to have better support strength.
In the present embodiment, be provided with maintenance channel 16 on the side wall of axle sleeve 2, facilitate staff from maintenance channel 16 into
Enter maintenance.
Then, the invention discloses a kind of double-fed blowers, including above-mentioned double-fed fan blade wheel hub axial direction telescopic device.
These are only the preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of double-fed fan blade wheel hub axial direction telescopic device, which is characterized in that including hub spindle (1), telescoping mechanism, axle sleeve
(2), one end of air velocity transducer (3), controller (4) and output shaft (5), the hub spindle (1) is connect with fan blade (6),
The other end is connect with telescoping mechanism, and the other end of the telescoping mechanism is connect with one end of output shaft (5), the output shaft (5)
The other end and the gear-box (7) of blower connect, the hub spindle (1) is telescopically plugged in one end of the axle sleeve (2)
And with the axle sleeve (2) synchronous rotary, the other end and the output shaft (5) of the axle sleeve (2) are affixed, the air velocity transducer
(3) it is connect with the controller (4), the controller (4) controls the telescoping mechanism and drives fortune before and after the hub spindle (1)
It is dynamic.
2. double-fed fan blade wheel hub axial direction telescopic device according to claim 1, which is characterized in that the hub spindle
(1) it is provided on spline (8), the hole of the axle sleeve (2) and the hub spindle (1) socket is splined hole (9).
3. double-fed fan blade wheel hub axial direction telescopic device according to claim 1, which is characterized in that the telescoping mechanism
Piston rod (11) for hydraulic cylinder (10), the hydraulic cylinder (10) is connect with hub spindle (1), the cylinder body of the hydraulic cylinder (10)
(12) it is connect with one end of output shaft (5).
4. double-fed fan blade wheel hub axial direction telescopic device according to claim 3, which is characterized in that the axle sleeve (2)
It inside include a hollow cavity (13), the hub spindle (1) is located in the inner cavity (13), and the hub spindle (1) is located in described
Limit stop ring (14) are provided in chamber, to limit the overhanging stroke of maximum of the hub spindle (1) as 1200mm.
5. according to any double-fed fan blade wheel hub axial direction telescopic device of claim 3-4, which is characterized in that the control
Device (4) processed connect with the hydraulic cylinder (10), drives the piston when increasing with the wind speed measured in the air velocity transducer (3)
Bar (11) stretches out, and the retract action of the piston rod (11) is retracted by the axial power drive that fan blade (6) generate.
6. double-fed fan blade wheel hub axial direction telescopic device according to claim 5, which is characterized in that the controller
(4) wireless telecommunications control mode is used between hydraulic cylinder (10).
7. double-fed fan blade wheel hub axial direction telescopic device according to claim 4, which is characterized in that further include being set to
Hydraulic device in inner cavity (13), the hydraulic device include the hydraulic cylinder (10), are provided on the axle sleeve (2) by axle sleeve
(2) brushgear (15) in the power Transmission to hydraulic device on the outside of.
8. double-fed fan blade wheel hub axial direction telescopic device according to claim 3, which is characterized in that the axle sleeve (2)
The thickness for being equipped with one end side wall of hub spindle (1) is greater than one end side wall that the axle sleeve (2) are equipped with hydraulic cylinder (10).
9. double-fed fan blade wheel hub axial direction telescopic device according to claim 3, which is characterized in that the axle sleeve (2)
Side wall on be provided with maintenance channel (16).
10. a kind of double-fed blower, which is characterized in that including the described in any item double-fed fan blade wheels of the claims 1-9
Hub axle is to telescopic device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810169035.6A CN108397361B (en) | 2018-02-28 | 2018-02-28 | A kind of double-fed fan blade wheel hub axial direction telescopic device and its double-fed blower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810169035.6A CN108397361B (en) | 2018-02-28 | 2018-02-28 | A kind of double-fed fan blade wheel hub axial direction telescopic device and its double-fed blower |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108397361A CN108397361A (en) | 2018-08-14 |
| CN108397361B true CN108397361B (en) | 2019-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810169035.6A Active CN108397361B (en) | 2018-02-28 | 2018-02-28 | A kind of double-fed fan blade wheel hub axial direction telescopic device and its double-fed blower |
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| Country | Link |
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| CN (1) | CN108397361B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112032005B (en) * | 2020-09-04 | 2022-08-12 | 天津大学 | Fan with tuned mass damper |
| CN112283022B (en) * | 2020-11-18 | 2024-03-22 | 西安热工研究院有限公司 | Impeller with adjustable number of blades and working method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR200459015Y1 (en) * | 2010-03-15 | 2012-03-21 | 전북대학교산학협력단 | Blade Tilt Control Device For Wind Power Generation |
| CN201723374U (en) * | 2010-06-07 | 2011-01-26 | 成都盛尔嘉科技有限公司 | Mechanical retractable-rotor wind generator |
| CN102330644A (en) * | 2011-09-09 | 2012-01-25 | 广东明阳风电产业集团有限公司 | Wind wheel locking device for wind generating set |
| CN204511771U (en) * | 2015-03-25 | 2015-07-29 | 广州红鹰能源科技股份有限公司 | A kind of telescopic type ACTIVE CONTROL wind power generating set |
| DE102015212906B4 (en) * | 2015-07-09 | 2020-10-29 | Innogy Se | Rotor blade attachment |
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Application publication date: 20180814 Assignee: Yiyang Aiyi Information Technology Co.,Ltd. Assignor: HUNAN INSTITUTE OF ENGINEERING Contract record no.: X2023980050675 Denomination of invention: A Double Fed Fan Blade Hub Axial Expansion Device and Double Fed Fan Granted publication date: 20191001 License type: Common License Record date: 20231213 |
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Application publication date: 20180814 Assignee: Yiyang Chuangxing Technology Co.,Ltd. Assignor: HUNAN INSTITUTE OF ENGINEERING Contract record no.: X2023980052753 Denomination of invention: A Double Fed Fan Blade Hub Axial Expansion Device and Double Fed Fan Granted publication date: 20191001 License type: Common License Record date: 20231219 |
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